Javascript Multiple Argument Memoization

Memoize.js

console.clear();

function mem2() {
  let iset = {};
  return (fn) => {
    return (...args) => {
    !(args in iset) && (iset[args] = fn(...args));
      return iset[args];
    }
  }
}


let xq = mem2()((x, y) => {
  return x + y
});
console.log(xq(10, 20));
console.log(xq(10, 25));
console.log(xq(10, 20));
console.log(xq(10, 25));